Gosset Bacterial cell membrane and cytoplasm Overview
The **bacterial cell membrane** (plasma membrane) is a selectively permeable phospholipid bilayer enclosing the bacterial cytoplasm, responsible for controlling nutrient and waste transport, energy production through respiration and photosynthesis, and synthesis of key macromolecules. The **cytoplasm** is a semi-liquid matrix containing water, enzymes, ribosomes for protein synthesis, metabolites, DNA in the nucleoid region (or plasmids), ions, and cytoskeletal elements that enable cell growth, metabolism, division, and shape maintenance. Together, these compartments are targeted by many antibiotics, but they are not singular, specific receptors or enzymes. Instead, they host numerous relevant molecular targets for antibacterial drug development (e.g., cell membrane proteins/enzymes, cytoplasmic ribosomes, DNA enzymes).
Mechanism of Action
Disrupt membrane integrity (e.g., lysis or increased permeability by antimicrobial peptides/drugs such as polymyxins); Inhibit protein synthesis (ribosome-targeting agents); Inhibit DNA replication and metabolism
Biological Functions
Disease Associations
Safety Considerations
- Drugs targeting the bacterial membrane may also harm host cell membranes if not specific, leading to toxicity
- Disruption of cytoplasmic metabolic pathways can affect beneficial commensal bacteria
Interacting Drugs
Associated Biomarkers
| Biomarker |
|---|
| Presence of bacterial cell wall components in host fluids (e.g., for infection diagnostics) |
| Bacterial ribosomal RNA for molecular diagnostics |